Replaced lfs->seed with lfs->gcksum for pseudorandom noise
lfs->seed was already just the rough xor of all mdir cksums, so
replacing it with our gcksum doesn't really do anything but make its
definition more rigorous.
That and save both code and ctx:
code stack ctx
before: 38560 2624 644
after: 38492 (-0.2%) 2624 (+0.0%) 640 (-0.6%)
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